Re: [RBW] More yummy fat road bike tires on the market
Let me know how you manage to actually mount them :) I had a heck of a time getting one on an A23 rim, and decided to return them. I couldn't see dealing with a puncture in the wild with such a tight tire. Cypres, brother. Cypres... Brian Seattle, WA On Tue, Mar 19, 2013 at 2:41 PM, William tapebu...@gmail.com wrote: I just ordered a pair of Challenge Eroica tires from Black Mountain Cycles. It's crazy how many great looking supple fat road tires there are now. These are 700x30 and look like they'd be a great choice for a Ram or Roadeo. Mike Varley does a nice ride report on his Black Mountain Cycles blog. We are in a golden age of awesome tire choices. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: Hupe or Fender for saddlebag support (if it rides too low)?
For saddlebags of any size, I use the Nitto R-14 rack underneath. I have one Carradice Nelson longflap, two Carradice Camper longflap, and one of the huge Baggins bags that Rivendell used to sell, and they all fit well with that rack. Quite apart from stopping the bag sagging onto the tyre or mudguard, it prevents the bag rotating forwards and hitting the back of my legs, but and also prevents the bag from swaying, particularly when it's only partly full. Preventing bag sway noticeably improves the feel of the bike, particularly when you get out of the saddle. On Friday, 15 March 2013 11:34:36 UTC+11, Michael wrote: Was wondering if there is no prob with letting your saddlebag slouch on top of the rear fender. Or is it better to use something else like a Hupe? Mine only touches fender a little. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: Bombadil v. 2.0 and new Fatty Rumpkins
This - plus riding your(Jim's) Long Hauloff Trucker both have me inspired. And searching my couch for spare change! My bike to grow old with is getting more expensive by the day! On Monday, March 18, 2013 10:43:53 PM UTC-5, Jim Thill - Hiawatha Cyclery wrote: PS: this has inspired me. I have a red Rohloff burning a hole in my pocket... -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Grand Bois Cypres vs Nifty Swifty
HI, I built up my Sam H. with the GB's (650B x 32) and love the ride they provide but I need to replace them. I'd get the GB's again but they did seem to wear a bit fast and I anticipate more commuting this season so a sturdy tire would be preferable unless it will really compromise the quality of the ride. It's why I am considering the Nifty S. Anyone have any thoughts? Any other 650 x 32-33 besides these and the maxy fastys. Thanks Brian -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Bombadil v. 2.0 and new Fatty Rumpkins
I know of only 4 other Riv Rohloff builds: You guys should do a tour together. Incredible bikes. On Tuesday, March 19, 2013 2:06:07 PM UTC-6, Pudge wrote: Very different bike. Version 1 was more of a road bike (rough and tumble, to be sure), drop bars, 35mm tires. This one is much more of an upright tourer style. Both very comfortable, but in different ways. This one is definitely heavier, but the weight seems largely to disappear when I’m riding (although I haven’t done any lengthy climbing with it yet). Hard to say which rides better – I’ve only ridden the new build about 10 miles. But I’ll say this -- I like v. 2.0 a lot because it’s unlike any other bike I have (and unlike almost any bike I’ve seen – I know of only 4 other Riv Rohloff builds: Jason Auch, who I think posts here sometimes, built up a beautiful Hunqa-loff a couple of years ago that’s kind of similar, pic here: http://www.flickr.com/photos/devildotbunny/5072896097/in/photostream/ ; Andy Church in CT has an SS coupled travel Homer with a Rohloff, here: http://www.flickr.com/photos/andychurch/7302143024/in/photostream/ ; Craig Montgomery has (or had, at any rate) a ’97 All-Rounder with a Rohloff on Jim’s Cyclofiend site, here: http://www.cyclofiend.com/cc/2005/cc023-craigmontgomery0705.html ; and I know Riv built up a Glorius with a Rohloff at a customer’s request some years ago, pic here: http://www.flickr.com/photos/reneeanddolan/259362085/. The complete known Rivendelloff galaxy (but there are doubtless numerous undiscovered others). *From:* rbw-owne...@googlegroups.com javascript: [mailto: rbw-owne...@googlegroups.com javascript:] *On Behalf Of *René Sterental *Sent:* Tuesday, March 19, 2013 3:16 PM *To:* rbw-owne...@googlegroups.com javascript: *Subject:* Re: [RBW] Bombadil v. 2.0 and new Fatty Rumpkins So... how do you feel the v2 with the Rolhoff compares to the v1 with a standard drivetrain? On Tue, Mar 19, 2013 at 11:38 AM, Allingham II, Thomas J thomas.a...@skadden.com javascript: wrote: It didn't SEEM cheesy. I just couldn't get it to work properly. Live and learn. The Rohloff tensioner IS excellent, no doubt. -Original Message- From: rbw-owne...@googlegroups.com javascript: [mailto: rbw-owne...@googlegroups.com javascript:] On Behalf Of Jim Thill - Hiawatha Cyclery Sent: Monday, March 18, 2013 11:36 PM To: rbw-owne...@googlegroups.com javascript: Subject: [RBW] Bombadil v. 2.0 and new Fatty Rumpkins I'll take the excellent Rohloff chain tensioner over some cheesy eccentric BB any day. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bun...@googlegroups.com javascript:. To post to this group, send email to rbw-own...@googlegroups.comjavascript: . Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out. -- To ensure compliance with Treasury Department regulations, we advise you that, unless otherwise expressly indicated, any federal tax advice contained in this message was not intended or written to be used, and cannot be used, for the purpose of (i) avoiding tax-related penalties under the Internal Revenue Code or applicable state or local tax law provisions or (ii) promoting, marketing or recommending to another party any tax-related matters addressed herein. This email (and any attachments thereto) is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this email, you are hereby notified that any dissemination, distribution or copying of this email (and any attachments thereto) is strictly prohibited. If you receive this email in error please immediately notify me at (212) 735-3000 and permanently delete the original email (and any copy of any email) and any printout thereof. Further information about the firm, a list of the Partners and their professional qualifications will be provided upon request. == -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bun...@googlegroups.com javascript:. To post to this group, send email to rbw-own...@googlegroups.comjavascript: . Visit this group at
[RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
It's incorrect to say that *any* metal that is cyclicly loaded will fatigue and fail eventually. Steel and titanium alloys have a fatigue limit, which means that there is an amplitude of stress below which the material will not fail no matter how many cycles of stress are applied. Aluminium, OTOH, does not have a fatigue limit and will eventually fail at any repeated stress. See for example, the diagram plotting stress against number of cycles to failure for steel and aluminium at http://en.wikipedia.org/wiki/File:S-N_curves.PNG. However, given proper design, the number of cycles to failure becomes extremely high. After all, there are still airlines flying DC-9s that are getting on for 40 years old, many airfreight 747s are over 30 years old, and the USAF is planning to keep B52s in the air until about 2040, by which time they will be getting on for 80 years old. And all those have aluminium airframes. In about 40 years of riding, the only pair of handlebars I've had break were a pair where the handlebar bag mount looped over the top of the bars each side of the stem and (I discovered after the bars broke) had worn a substantial groove in the bar. Outside of bars being damaged like that, I only replace bars if they've been crashed and bent. I think the oldest pair I have in use are about 30 years old - Cinelli Campione del Mondo. On Tuesday, 19 March 2013 08:10:09 UTC+11, William wrote: You pose two questions: 1. Anyone know anything about aluminum bar life? I know a little bit about fatigue life of materials. Any metal that is cyclicly loaded will fatigue and fail eventually. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: Which kinda washer for Sam brake bridge fender mount/plastic SKS fender.
Actually for direct mounting a metal fender onto a bridge with a bolt that goes through the fender you use a leather washer to increase fender life and reduce noise, between fender and bridge. Metal washer inside fender. Gernot -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] More yummy fat road bike tires on the market
Are you using Velox (read: thick) rim tape? The Challenge-A23 difficulty can be tackled by using either Velocity's own Veloplugs or a thin rim tape like Ritchey or Rox. The Challenge tires, at least the Parigi-Roubaix, do stretch out a bit after use so they do get significantly easier to (dis)mount after a couple of hundred miles. On Wednesday, March 20, 2013 2:08:40 PM UTC+8, stonehog wrote: Let me know how you manage to actually mount them :) I had a heck of a time getting one on an A23 rim, and decided to return them. I couldn't see dealing with a puncture in the wild with such a tight tire. Cypres, brother. Cypres... Brian Seattle, WA On Tue, Mar 19, 2013 at 2:41 PM, William tape...@gmail.com javascript:wrote: I just ordered a pair of Challenge Eroica tires from Black Mountain Cycles. It's crazy how many great looking supple fat road tires there are now. These are 700x30 and look like they'd be a great choice for a Ram or Roadeo. Mike Varley does a nice ride report on his Black Mountain Cycles blog. We are in a golden age of awesome tire choices. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bun...@googlegroups.com javascript:. To post to this group, send email to rbw-owne...@googlegroups.comjavascript: . Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
great photo Philip. I put 30 years on a GB Maes bend. Jim, as far as the cycle and S-N curve goes, only cycles that are 70% or greater of the permanent bending load count. Everything below that is within the endurance limit. On Monday, March 18, 2013 6:15:07 PM UTC-5, Philip Williamson wrote: So aluminum bars sag before breaking? I only ask, because I'm a 250 lb guy using 25 year old WTB offroad drops on a fixed gear bike... offroad sometimes. http://www.flickr.com/photos/philipwilliamson/8547042814/ Philip www.biketinker.com On Monday, March 18, 2013 2:49:21 PM UTC-7, William wrote: Jim I think that's what I said. The cycle life is determined by how it's loaded, and is captured on an S-N curve. You are correct that a tiny load is at the ultra-long life end of the S-N curve. If the S-N curve tells us that the cycle life is 50million cycles, and if you do 100,000 cycles per year, then Bob's your uncle, it's 500 years of life. For all us (relatively) normal people, we have no clue what cycle we are on. So we are left with judgement. Like I weigh 170, and I don't reef on my bars too hard, so I think I'll worry after 20 years or when I notice my bars sagging, whichever comes first. Someone else may decide I weigh 110, and it's a path bike. I'll never replace bars out of fear. Finally, another person might say I weigh 240 and sprint to every single city limit sign, and climb out of the saddle on my fixie on every hill. 5 years sounds like a good plan The thing that shocks me is how often I see people using bars that are visibly sagging. The tops of the handlebars drooping downward, and the hooks no longer parallel. That's scary. On Monday, March 18, 2013 2:21:42 PM UTC-7, Jim Thill - Hiawatha Cyclery wrote: The number of years is irrelevant. Some skinny person who rides upright and gingerly on smooth roads 5 miles per week is going to get 500 years out of the bar. On Monday, March 18, 2013 4:10:09 PM UTC-5, William wrote: You pose two questions: 1. Anyone know anything about aluminum bar life? I know a little bit about fatigue life of materials. Any metal that is cyclicly loaded will fatigue and fail eventually. Just about every metal has a similar look to it on an S-N curve (Wikipedia that for an explanation). The take home is that almost everything eventually wears out and fails. It's just a matter of when. Steel is a notable exception. If steel is cyclicly loaded at a low enough Stress, then it essentially never fatigues. Incredible stuff. Anyway, Aluminum does fatigue and fail...eventually. When? It depends on how much you are stressing it and how many cycles you put on it daily. 2. Do I need to throw away the old used set of bars I have? Nitto is going to say what they say because they generate these S-N curves and test the heck out of their products. They do see parts fail after lots of cycles, and what they recommend is going to be conservative. When Nitto says 5 years, I think 20. I do not think 50 years. You don't know when your bars are going to fail unless you know REALLY accurately what the loading history of your bars is. In other words, you have no idea. Anybody who decides to buy and ride used equipment assumes some additional risk because you just don't know for sure what the history is. If you think you would feel a lot more comfortable replacing your handlebars, then I'd say do it. On Monday, March 18, 2013 12:50:43 PM UTC-7, Michael wrote: In a cool interview with Nitto exec Mr. Yoshikawa, Grant asks this question. Nitto exec leaves it up to consumer. So I was wondering if anything to be concerned about. Anyone know anything about aluminum bar life? Do I need to throw away the old used set of bars I have? Don't want any accidents. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
p.s. - misusing science in marketing is known by marketers as the snow job On Monday, March 18, 2013 2:50:43 PM UTC-5, Michael wrote: In a cool interview with Nitto exec Mr. Yoshikawa, Grant asks this question. Nitto exec leaves it up to consumer. So I was wondering if anything to be concerned about. Anyone know anything about aluminum bar life? Do I need to throw away the old used set of bars I have? Don't want any accidents. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Optimal clearance for metal fenders...
On Tue, 2013-03-19 at 15:38 -0400, David Hays wrote: Down the road I was hoping to put Hetres and fenders on it but I'm hearing serious reservations from people. What reservations? Here are the issues regarding the bike: http://janheine.wordpress.com/2013/01/27/does-my-bike-take-fenders/ I don't know about the Hilsen. I do know that some other Riv frames have had serious issues regarding the chainstay bridge distance being far too large, making it very hard to achieve a good fender line. I know that on my Saluki there was insufficient clearance at the chain stays to fit a 58mm wide (that's the widest size) Honjo, so I had to trim the fender, as can be seen here: http://www.flickr.com/photos/97916047@N00/sets/72157617915097787/show/ Assuming the bike presents no major problems, the biggest issue is that mounting Honjos takes patience and cannot be hurried. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: Glorius and Wilbury
I do have an original Rivendell mixte which I never built. I purchased both an Atlantis and mixte some years ago and later concluded that I would not be able to raise the handlebars high enough for my very upright age 60+ riding style. I recently sold the Atlantis and would like to sell the mixte. It is a 52mm. The price is $2100 plus shipping. In recent discussions with Kevin about a custom mountain mixte, he did offer me $1800 toward the custom for the mixte. This was a bit more than his last offer when we had a similar discussion about I year ago. (I only mention this because I think somewhere there is a post about his last offer and I didn't want anyone to think i was just inflating his offer.) I still may do the custom, but I want to experience my recently built Yves Gomez mixte from a size perspective before I make that jump. Pictures of the mixte here as are pictures of the Yves Gomez (in British Racing green). http://www.flickr.com/photos/7338969@N06/7583232160/in/photostream/lightbox/ Contact me if interested. Charlie in CT -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: Grand Bois Cypres vs Nifty Swifty
The Spring issue of *Bicycle Quarterly* summarizes all our tire tests, so you can see how the performance of the Grand Bois compares to both the Nifty-Swifty, the Maxy-Fasty and dozens of other tires. More information on that issue is here: http://janheine.wordpress.com/ Jan Heine Editor Bicycle Quarterly http://www.bikequarterly.com Follow our blog at http://janheine.wordpress.com/ -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
It was William who introduced the concept of S-N curves, not Jim. I don't think he misused science in his explanation. That said, it's somewhat simplistic to reduce the complicated fatigue life of bicycles to relationships discovered in controlled lab settings. In the real world, bike parts do break, even if they're made of steel. This is observed reality at least once a week at my job. If you dig into the science of why things break, you can certainly learn a lot of terminology and study endless log-scale graphs. You can get a PhD in the subject, which I tried once. Even the smartest guy or gal in the room can only begin to guess what sorts of stresses a handlebar will endure (or has endured), what scenarios will lead to eventual failure, or how long that will take. As somebody pointed out, even a good bar can fail prematurely if clamped improperly in the stem. What of faulty heat treating or surface defects or undetectable debts and dings that become stress risers? I've only just scratched the surface of muddying the waters of science and its predictions... Nitto makes their best guess, erring on the side of safety, and says 5 years of use. Obviously many bars last much longer, and a few don't even make it to 5 years. Personally, I'm not concerned about this arbitrary number. If you are concerned, I say buy a new bar. It's worth $100 or whatever for peace of mind. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Grand Bois Cypres vs Nifty Swifty
Get Hetres. They will spoil you for all other tires. They will actually improve ride quality, won't increase rolling resistance noticeably (or may even lower it on rough roads), will last much longer (3-4000miles?) and will be much more flat resistant simply because they are wider and are thus run at lower pressure. Gernot (who wishes his 56cm Sam had 650b wheels so he could run Hetres, but who has them on another bike) -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] More yummy fat road bike tires on the market
*Sometimes I will buy tires that won't fit on any of my bikes, and then acquire a bike to fit the tires.. * Tragic, but hysterical (sorry Bill)... although I admit I've lusted after a set of Hetre reds with the notion that I'll figure out the 'bike thing' later... On Tuesday, March 19, 2013 5:48:29 PM UTC-4, William wrote: Hello. My name is Bill, and I'm a tire-o-holic Sometimes I will skip coffee for a while to save up for tires Sometimes I will buy tires that won't fit on any of my bikes, and then acquire a bike to fit the tires I currently have in my possession a total of 59 650B tires I'm down on 700c, and now have a mere 16 tires to share between two bikes On Tuesday, March 19, 2013 2:42:51 PM UTC-7, Pudge wrote: Because you’re a little short on tires in inventory, Bill? *From:* rbw-owne...@googlegroups.com [mailto:rbw-owne...@googlegroups.com] *On Behalf Of *William *Sent:* Tuesday, March 19, 2013 5:42 PM *To:* rbw-owne...@googlegroups.com *Subject:* [RBW] More yummy fat road bike tires on the market I just ordered a pair of Challenge Eroica tires from Black Mountain Cycles. It's crazy how many great looking supple fat road tires there are now. These are 700x30 and look like they'd be a great choice for a Ram or Roadeo. Mike Varley does a nice ride report on his Black Mountain Cycles blog. We are in a golden age of awesome tire choices. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bun...@googlegroups.com. To post to this group, send email to rbw-own...@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out. -- To ensure compliance with Treasury Department regulations, we advise you that, unless otherwise expressly indicated, any federal tax advice contained in this message was not intended or written to be used, and cannot be used, for the purpose of (i) avoiding tax-related penalties under the Internal Revenue Code or applicable state or local tax law provisions or (ii) promoting, marketing or recommending to another party any tax-related matters addressed herein. This email (and any attachments thereto) is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this email, you are hereby notified that any dissemination, distribution or copying of this email (and any attachments thereto) is strictly prohibited. If you receive this email in error please immediately notify me at (212) 735-3000 and permanently delete the original email (and any copy of any email) and any printout thereof. Further information about the firm, a list of the Partners and their professional qualifications will be provided upon request. == -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
I thought-think-was taught that steel has a load limit below which it can withstand a theoretically infinite number of cycles (flexes), but that aluminum has no such thing. Permanent bending load limit is the Yield strength. Yield strength is the force required to bend a material to the point where it doesn't snap back all straight again. Spring steel (used in springs) has a high yield strength; paperclip steel (used in ) is the opposite. On this topic, vaguely: I was at a materials testing facility two days ago, and remember the hooplah I set off when I suggested that maybe modulus varies with UTS (sorry for the jargon, but I'm too tired to explain). I got so much correction mail that I was forced into a slightly insincere recantation. Well...the head guy at this place was saying that a crank arm made of X would be stiffer than one of idental design made of Y, and so I said politely, Oh really? and he said of course, and I said what about modulus's independence of UTS? and he said no way, we've done this test a zillion times, and then showed me a tech insider's website that listed diff moduli for two alum alloys of diff strengths. I'm just here to cause trouble. I won't respond to an discussions on this, on account of I've beenthere done that...and I will always play my two year diploma, what kind of fool listens to me? card, if pressed. On Wednesday, March 20, 2013 8:08:03 PM UTC+8, Ron Mc wrote: great photo Philip. I put 30 years on a GB Maes bend. Jim, as far as the cycle and S-N curve goes, only cycles that are 70% or greater of the permanent bending load count. Everything below that is within the endurance limit. On Monday, March 18, 2013 6:15:07 PM UTC-5, Philip Williamson wrote: So aluminum bars sag before breaking? I only ask, because I'm a 250 lb guy using 25 year old WTB offroad drops on a fixed gear bike... offroad sometimes. http://www.flickr.com/photos/philipwilliamson/8547042814/ Philip www.biketinker.com On Monday, March 18, 2013 2:49:21 PM UTC-7, William wrote: Jim I think that's what I said. The cycle life is determined by how it's loaded, and is captured on an S-N curve. You are correct that a tiny load is at the ultra-long life end of the S-N curve. If the S-N curve tells us that the cycle life is 50million cycles, and if you do 100,000 cycles per year, then Bob's your uncle, it's 500 years of life. For all us (relatively) normal people, we have no clue what cycle we are on. So we are left with judgement. Like I weigh 170, and I don't reef on my bars too hard, so I think I'll worry after 20 years or when I notice my bars sagging, whichever comes first. Someone else may decide I weigh 110, and it's a path bike. I'll never replace bars out of fear. Finally, another person might say I weigh 240 and sprint to every single city limit sign, and climb out of the saddle on my fixie on every hill. 5 years sounds like a good plan The thing that shocks me is how often I see people using bars that are visibly sagging. The tops of the handlebars drooping downward, and the hooks no longer parallel. That's scary. On Monday, March 18, 2013 2:21:42 PM UTC-7, Jim Thill - Hiawatha Cyclery wrote: The number of years is irrelevant. Some skinny person who rides upright and gingerly on smooth roads 5 miles per week is going to get 500 years out of the bar. On Monday, March 18, 2013 4:10:09 PM UTC-5, William wrote: You pose two questions: 1. Anyone know anything about aluminum bar life? I know a little bit about fatigue life of materials. Any metal that is cyclicly loaded will fatigue and fail eventually. Just about every metal has a similar look to it on an S-N curve (Wikipedia that for an explanation). The take home is that almost everything eventually wears out and fails. It's just a matter of when. Steel is a notable exception. If steel is cyclicly loaded at a low enough Stress, then it essentially never fatigues. Incredible stuff. Anyway, Aluminum does fatigue and fail...eventually. When? It depends on how much you are stressing it and how many cycles you put on it daily. 2. Do I need to throw away the old used set of bars I have? Nitto is going to say what they say because they generate these S-N curves and test the heck out of their products. They do see parts fail after lots of cycles, and what they recommend is going to be conservative. When Nitto says 5 years, I think 20. I do not think 50 years. You don't know when your bars are going to fail unless you know REALLY accurately what the loading history of your bars is. In other words, you have no idea. Anybody who decides to buy and ride used equipment assumes some additional risk because you just don't know for sure what the history is. If you think you would feel a lot more comfortable replacing your handlebars, then I'd say do it. On Monday, March
Re: [RBW] More yummy fat road bike tires on the market
Hello. My name is Liesl, and I'm a bag-o-holic Sometimes I will skip tires for a while to save up for bags Sometimes I will buy bags that don't match on any of my bags, and then acquire a rack, more bags, a hat, and paint my bike so that everything matches I currently have in my possession a total of 4 saddle bags, 4 panniers, 4 handlebar bags, and 2 l'il loafers I'm down on tweeds, and have only 1 tweed l'il loafer to share between two bikes. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
as far as the cycle and S-N curve goes, only cycles that are 70% or greater of the permanent bending load count. Everything below that is within the endurance limit. Steel has an endurance limit. Moderately stressed steel, cycled below the endurance limit, lasts forever (if you'll pardon the term). That's why I said steel is such incredible stuff. It really is incredible. We were talking about aluminum. Aluminum has no endurance limit. The lower the cycling stress, the longer it lasts, but there is no lower limit below which the stress cycles don't count. I'm not trying to snow anybody and I am not an employee of the Nitto marketing department. On Wednesday, March 20, 2013 5:08:03 AM UTC-7, Ron Mc wrote: great photo Philip. I put 30 years on a GB Maes bend. Jim, as far as the cycle and S-N curve goes, only cycles that are 70% or greater of the permanent bending load count. Everything below that is within the endurance limit. On Monday, March 18, 2013 6:15:07 PM UTC-5, Philip Williamson wrote: So aluminum bars sag before breaking? I only ask, because I'm a 250 lb guy using 25 year old WTB offroad drops on a fixed gear bike... offroad sometimes. http://www.flickr.com/photos/philipwilliamson/8547042814/ Philip www.biketinker.com On Monday, March 18, 2013 2:49:21 PM UTC-7, William wrote: Jim I think that's what I said. The cycle life is determined by how it's loaded, and is captured on an S-N curve. You are correct that a tiny load is at the ultra-long life end of the S-N curve. If the S-N curve tells us that the cycle life is 50million cycles, and if you do 100,000 cycles per year, then Bob's your uncle, it's 500 years of life. For all us (relatively) normal people, we have no clue what cycle we are on. So we are left with judgement. Like I weigh 170, and I don't reef on my bars too hard, so I think I'll worry after 20 years or when I notice my bars sagging, whichever comes first. Someone else may decide I weigh 110, and it's a path bike. I'll never replace bars out of fear. Finally, another person might say I weigh 240 and sprint to every single city limit sign, and climb out of the saddle on my fixie on every hill. 5 years sounds like a good plan The thing that shocks me is how often I see people using bars that are visibly sagging. The tops of the handlebars drooping downward, and the hooks no longer parallel. That's scary. On Monday, March 18, 2013 2:21:42 PM UTC-7, Jim Thill - Hiawatha Cyclery wrote: The number of years is irrelevant. Some skinny person who rides upright and gingerly on smooth roads 5 miles per week is going to get 500 years out of the bar. On Monday, March 18, 2013 4:10:09 PM UTC-5, William wrote: You pose two questions: 1. Anyone know anything about aluminum bar life? I know a little bit about fatigue life of materials. Any metal that is cyclicly loaded will fatigue and fail eventually. Just about every metal has a similar look to it on an S-N curve (Wikipedia that for an explanation). The take home is that almost everything eventually wears out and fails. It's just a matter of when. Steel is a notable exception. If steel is cyclicly loaded at a low enough Stress, then it essentially never fatigues. Incredible stuff. Anyway, Aluminum does fatigue and fail...eventually. When? It depends on how much you are stressing it and how many cycles you put on it daily. 2. Do I need to throw away the old used set of bars I have? Nitto is going to say what they say because they generate these S-N curves and test the heck out of their products. They do see parts fail after lots of cycles, and what they recommend is going to be conservative. When Nitto says 5 years, I think 20. I do not think 50 years. You don't know when your bars are going to fail unless you know REALLY accurately what the loading history of your bars is. In other words, you have no idea. Anybody who decides to buy and ride used equipment assumes some additional risk because you just don't know for sure what the history is. If you think you would feel a lot more comfortable replacing your handlebars, then I'd say do it. On Monday, March 18, 2013 12:50:43 PM UTC-7, Michael wrote: In a cool interview with Nitto exec Mr. Yoshikawa, Grant asks this question. Nitto exec leaves it up to consumer. So I was wondering if anything to be concerned about. Anyone know anything about aluminum bar life? Do I need to throw away the old used set of bars I have? Don't want any accidents. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at
[RBW] Re: Bombadil v. 2.0 and new Fatty Rumpkins
On Monday, March 18, 2013 8:10:01 PM UTC-5, Ryan wrote: Sorry...speechless. That looks like a Swiss Army bike for sure. I like the black. You could travel the world on thatneat components Here's a Swiss Army bike for sure... https://lh6.googleusercontent.com/-_DHDYhgscOc/UUnl7FcoD4I/ABU/hSRzuBpwxOA/s1600/PC260173.JPG -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Grand Bois Cypres vs Nifty Swifty
The Hetres are great tires. I ended up using the Soma B-Sides on my wife's Betty Foy with great sucess. I needed something that would fit under longboard fenders. As the regular version appears out of stock everywhere the Hypertex version that Riv sells could be an option. Would Schwalbe Marathons just be too sluggish for you? If I needed a super dependable commute tire I would head in that direction. Dan - Marin On Wed, Mar 20, 2013 at 8:18 AM, Earl Grey earlg...@gmail.com wrote: Get Hetres. They will spoil you for all other tires. They will actually improve ride quality, won't increase rolling resistance noticeably (or may even lower it on rough roads), will last much longer (3-4000miles?) and will be much more flat resistant simply because they are wider and are thus run at lower pressure. Gernot (who wishes his 56cm Sam had 650b wheels so he could run Hetres, but who has them on another bike) -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Re: Grand Bois Cypres vs Nifty Swifty
If the Hetres won't fit, try the Lierres.
René
On Wednesday, March 20, 2013, Dan McNamara wrote:
The Hetres are great tires.
I ended up using the Soma B-Sides on my wife's Betty Foy with great
sucess. I needed something that would fit under longboard fenders. As the
regular version appears out of stock everywhere the Hypertex version that
Riv sells could be an option. Would Schwalbe Marathons just be too sluggish
for you? If I needed a super dependable commute tire I would head in that
direction.
Dan
- Marin
On Wed, Mar 20, 2013 at 8:18 AM, Earl Grey
earlg...@gmail.comjavascript:_e({}, 'cvml', 'earlg...@gmail.com');
wrote:
Get Hetres. They will spoil you for all other tires. They will actually
improve ride quality, won't increase rolling resistance noticeably (or may
even lower it on rough roads), will last much longer (3-4000miles?) and
will be much more flat resistant simply because they are wider and are thus
run at lower pressure.
Gernot (who wishes his 56cm Sam had 650b wheels so he could run Hetres,
but who has them on another bike)
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[RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
Sorry Grant, William, Jim - I stand corrected - aluminum has no endurance limit. Monolithic is the term. On Monday, March 18, 2013 2:50:43 PM UTC-5, Michael wrote: In a cool interview with Nitto exec Mr. Yoshikawa, Grant asks this question. Nitto exec leaves it up to consumer. So I was wondering if anything to be concerned about. Anyone know anything about aluminum bar life? Do I need to throw away the old used set of bars I have? Don't want any accidents. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] More yummy fat road bike tires on the market
Ha ha ha ha!!! And to think that's wife thinks I'm crazy when it comes to
my bikes, tires, bags, handlebars. saddles...
On Wednesday, March 20, 2013, Liesl wrote:
Hello.
My name is Liesl, and I'm a bag-o-holic
Sometimes I will skip tires for a while to save up for bags
Sometimes I will buy bags that don't match on any of my bags, and then
acquire a rack, more bags, a hat, and paint my bike so that everything
matches
I currently have in my possession a total of 4 saddle bags, 4 panniers, 4
handlebar bags, and 2 l'il loafers
I'm down on tweeds, and have only 1 tweed l'il loafer to share between two
bikes.
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Re: [RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
I have an idea! Let's talk about carbon fiber bars! Seriously, what about them? On Wed, Mar 20, 2013 at 11:49 AM, Ron Mc bulldog...@gmail.com wrote: Sorry Grant, William, Jim - I stand corrected - aluminum has no endurance limit. Monolithic is the term. On Monday, March 18, 2013 2:50:43 PM UTC-5, Michael wrote: In a cool interview with Nitto exec Mr. Yoshikawa, Grant asks this question. Nitto exec leaves it up to consumer. So I was wondering if anything to be concerned about. Anyone know anything about aluminum bar life? Do I need to throw away the old used set of bars I have? Don't want any accidents. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out. -- __ BUSINESS BUILDING COME-ON!! $300 off a $600 resume + letter or Linked In profile package with referral that leads to full price sale! Refer two full-pay clients and you get the package for free! I am not cheap, but I am very good. So they say. http://resumespecialties.com/testimonials.html Patrick Moore, Ph.D, MBA, ACRW, Albuquerque, NM, USA http://resumespecialties.com/index.html * patrickmo...@resumespecialties.com __ -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Bikes of the Month (Bike of the Months?)
I just noticed that both BOMs (BsOM?) are marked SOLD. I'm happy to see that. On one hand it removes the temptation for me to buy that 54cm Hunqa, but on the other hand it's cool to see that generating a little cash flow for Riv. Congrats to the new owners of those two great looking bikes! -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Bikes of the Month (Bike of the Months?)
I just saw that too, awesome to know two lucky people got some tricked out rides. Back in the day I had a 54cm Hunq I was about to buy at Harris Cyclery but it just looked so small and I was afraid it would be all seatpost and handlebars. Should have just bought it at the bargain price of $1,500 and put it in the basement, haha. On Wed, Mar 20, 2013 at 2:14 PM, William tapebu...@gmail.com wrote: I just noticed that both BOMs (BsOM?) are marked SOLD. I'm happy to see that. On one hand it removes the temptation for me to buy that 54cm Hunqa, but on the other hand it's cool to see that generating a little cash flow for Riv. Congrats to the new owners of those two great looking bikes! -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] More yummy fat road bike tires on the market
Brian Thanks for the heads up/warning. I will let you know how easy or hard it is to mount these tires. On Tuesday, March 19, 2013 11:08:40 PM UTC-7, stonehog wrote: Let me know how you manage to actually mount them :) I had a heck of a time getting one on an A23 rim, and decided to return them. I couldn't see dealing with a puncture in the wild with such a tight tire. Cypres, brother. Cypres... Brian Seattle, WA On Tue, Mar 19, 2013 at 2:41 PM, William tape...@gmail.com javascript:wrote: I just ordered a pair of Challenge Eroica tires from Black Mountain Cycles. It's crazy how many great looking supple fat road tires there are now. These are 700x30 and look like they'd be a great choice for a Ram or Roadeo. Mike Varley does a nice ride report on his Black Mountain Cycles blog. We are in a golden age of awesome tire choices. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bun...@googlegroups.com javascript:. To post to this group, send email to rbw-owne...@googlegroups.comjavascript: . Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Re: Brakes question
Rene Also look to the straddle cable itself on the Paul in front. Make sure that it's straightened out. Make sure that none of your lever travel is used up simply pulling the arc shape out of the straddle cable. Pauls, in my experience, are shipped with a pretty stiff straddle cable, and you have to make a real effort to give it a little bend at the two edges of the carrier, and you have to give it a little bend with your thumb at the anchor as well. That might result in giving you more slack than you thought you had, will result in the pads being farther from the rims, and will allow you to pull up some slack at the barrel adjuster. On Tuesday, March 19, 2013 4:26:18 PM UTC-7, René wrote: I'll try that, but the pads are already quite close to the rims. On the flats, they start biting quite early on the travel of the lever. Also, these levers are designed for cantilever and sidepull brakes, so it's strange that they wouldn't work. The other thing I'm going to try, is to raise the yoke higher on the front Racer brake to see if it reduces the mechanical advantage and increases the braking power. There's nothing I can do on the rear, but it's the front one the one that stops you on a downhill, so I'll start there. René On Tue, Mar 19, 2013 at 4:11 PM, Joe Bernard joer...@gmail.comjavascript: wrote: You might want to try mounting the pads closer to the rims as they would be on a tt/tri-bike, which is primarily what these levers were designed for. If you compare the arc of mtb and road levers, there is noticeably more air between the lever and bar, giving you more travel before bottoming out. I think you're running out of lever before the brakes are done braking. Joe Baernard Vallejo, CA. On Tuesday, March 19, 2013 3:56:35 PM UTC-7, René wrote: On Sunday I took a nice 20 mile bike ride on the Los Gatos Creek Trail on my Betty. At the end of the outbound leg, there are two steep climbs, one on dirt (avg. 16%) and one on pavement that is longer (avg. 13%). The Betty is equiped with Tektro 4.1 reverse brake levers, a front Paul Racer brake and a rear Silver brake, both with salmon pads. On the way down, I realized I couldn't lock the wheels or come to a complete stop. The bike just kept rolling, even though I was pressing the levers as far as they'd go to the bars. On flats, you need much less pressure to come to a stop. Both front and rear brakes felt the same. Luckily, I wasn't forced to come to a full stop or I would have crashed. What gives? This is the first time this happens to me. Is it something on the setup I'd need to change? Fully perplexed, René -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bun...@googlegroups.com javascript:. To post to this group, send email to rbw-owne...@googlegroups.comjavascript: . Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
I find all of this interesting, but am coming at it from a different direction; as a geologist, I (used to) look at a lot of structural deformation on rock (instead of steel), looking at elastic deformation versus plastic deformation, stress versus strain, Mohr's circles, Young's modulus, etc. etc..; looking at rock, it's different than steel, but, at the same time, it's applying the same concepts... Carry on, I'm enjoying this from the sidelines -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
Leslie Was Popov your undergrad text on mechanics of materials? On Wednesday, March 20, 2013 11:58:19 AM UTC-7, Leslie wrote: I find all of this interesting, but am coming at it from a different direction; as a geologist, I (used to) look at a lot of structural deformation on rock (instead of steel), looking at elastic deformation versus plastic deformation, stress versus strain, Mohr's circles, Young's modulus, etc. etc..; looking at rock, it's different than steel, but, at the same time, it's applying the same concepts... Carry on, I'm enjoying this from the sidelines -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: Brakes question
Excellent idea! I've noticed the same.
On Wednesday, March 20, 2013, William wrote:
Rene
Also look to the straddle cable itself on the Paul in front. Make sure
that it's straightened out. Make sure that none of your lever travel is
used up simply pulling the arc shape out of the straddle cable. Pauls, in
my experience, are shipped with a pretty stiff straddle cable, and you have
to make a real effort to give it a little bend at the two edges of the
carrier, and you have to give it a little bend with your thumb at the
anchor as well. That might result in giving you more slack than you
thought you had, will result in the pads being farther from the rims, and
will allow you to pull up some slack at the barrel adjuster.
On Tuesday, March 19, 2013 4:26:18 PM UTC-7, René wrote:
I'll try that, but the pads are already quite close to the rims. On the
flats, they start biting quite early on the travel of the lever. Also,
these levers are designed for cantilever and sidepull brakes, so it's
strange that they wouldn't work.
The other thing I'm going to try, is to raise the yoke higher on the
front Racer brake to see if it reduces the mechanical advantage and
increases the braking power. There's nothing I can do on the rear, but it's
the front one the one that stops you on a downhill, so I'll start there.
René
On Tue, Mar 19, 2013 at 4:11 PM, Joe Bernard joer...@gmail.com wrote:
You might want to try mounting the pads closer to the rims as they would
be on a tt/tri-bike, which is primarily what these levers were designed
for. If you compare the arc of mtb and road levers, there is noticeably
more air between the lever and bar, giving you more travel before bottoming
out. I think you're running out of lever before the brakes are done braking.
Joe Baernard
Vallejo, CA.
On Tuesday, March 19, 2013 3:56:35 PM UTC-7, René wrote:
On Sunday I took a nice 20 mile bike ride on the Los Gatos Creek Trail
on my Betty. At the end of the outbound leg, there are two steep climbs,
one on dirt (avg. 16%) and one on pavement that is longer (avg. 13%).
The Betty is equiped with Tektro 4.1 reverse brake levers, a front Paul
Racer brake and a rear Silver brake, both with salmon pads.
On the way down, I realized I couldn't lock the wheels or come to a
complete stop. The bike just kept rolling, even though I was pressing the
levers as far as they'd go to the bars. On flats, you need much less
pressure to come to a stop. Both front and rear brakes felt the same.
Luckily, I wasn't forced to come to a full stop or I would have crashed.
What gives? This is the first time this happens to me. Is it something
on the setup I'd need to change?
Fully perplexed,
René
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Re: [RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
I'm starting to understand the thinking behind all that thick, heavy steel on 3-speed Raleighs... Joe Um, carbon bar? No thanks Bernard Vallejo, CA. On Wednesday, March 20, 2013 12:04:11 PM UTC-7, William wrote: Leslie Was Popov your undergrad text on mechanics of materials? On Wednesday, March 20, 2013 11:58:19 AM UTC-7, Leslie wrote: I find all of this interesting, but am coming at it from a different direction; as a geologist, I (used to) look at a lot of structural deformation on rock (instead of steel), looking at elastic deformation versus plastic deformation, stress versus strain, Mohr's circles, Young's modulus, etc. etc..; looking at rock, it's different than steel, but, at the same time, it's applying the same concepts... Carry on, I'm enjoying this from the sidelines -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: Grand Bois Cypres vs Nifty Swifty
I have ridden Nifty Swifties, Michelin Axial Raid, Michelin Megamium, Hutchinson 650B Confriere, Grand Bois Cypres, and Soma Xpress. (yes, I put serious miles on my tires. I wore them all out!) Some wear out faster than others. My experience, please take it with a grain of salt Nifty Swifty - sturdy tires. Wear well. Tan sidewall. I think I still have one in the garage I would use in a pinch Michelin Axial Raid - sturdy tires, wear well, ride well. Folding. I think. Unfortunately, made of unobtanium Michelin Megamium - like the Raid, but all black. Folding. Tightest bead ever, G-d help you if you get a flat in the cold and rain. But sturdy. Hutchinson - very sturdy tire; good riding, got over 4000 miles on them. Gray sidewall. Folding. Still keep one around as a spare. Very light. Grand Bois Cypres - nice to ride on. Almost as light as the Hutchinson. Folding. I had more flats with them than any other tire in my life. Retired after 2000 miles Soma Xpress - like riding on nice pillows. Do not appear to slow me down. Folding. Tan sidewall. Not enough miles to assess durability, but they look pretty sturdy. Cheers, Lynne F On Tuesday, March 19, 2013 9:38:20 AM UTC-7, Brian wrote: HI, I built up my Sam H. with the GB's (650B x 32) and love the ride they provide but I need to replace them. I'd get the GB's again but they did seem to wear a bit fast and I anticipate more commuting this season so a sturdy tire would be preferable unless it will really compromise the quality of the ride. It's why I am considering the Nifty S. Anyone have any thoughts? Any other 650 x 32-33 besides these and the maxy fastys. Thanks Brian -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: FS 68cm Quickbeam
Nice bike, shows a lot of thought. What did you think of the mustache bars? Jim D Massachusetts On Tuesday, March 19, 2013 3:00:58 PM UTC-4, Kelly wrote: S... if no one bites I get to keep it :) On Tuesday, March 19, 2013 10:16:42 AM UTC-5, BSWP wrote: Wow, what a great deal for such a rare TALL frame. - Andrew, Berkeley -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
On Wednesday, March 20, 2013 3:04:11 PM UTC-4, William wrote: Leslie Was Popov your undergrad text on mechanics of materials? No; being in geology, I had Dana's for Mineralogy (well, Klein/Hurlbut after Dana's), Blatt for Petrology, Davis for Structural, then later Hatcher for Structural further... also a lot from Telford in Applied Geophysics, too; but I didn't have 'material' science (as far as metals testing, etc., as the engineering side would have...)BS in stright-laced field geology, MS is in engineering geology, but dealt more with slope stability, engineering properties of geologic materials (ASTM testing, soils, etc.), hydrogeology, etc. If I was over on the engineering side of campus, probably would have; but not on my side -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Bikes of the Month (Bike of the Months?)
If I understood the announcement, the Bike-O-The-Month is only for bikes which were sold. The folks at RBW who built them up suggest them for photos before they are boxed and/or delivered, and they then pick one each month as a unique or exemplary build. Since there's such a variance in the each bicycle is actually spec'd, I think one of the benefits is that it get people thinking about the variety of ways to rig theirs up. Yeah - I'm enjoying it! - J On Mar 20, 2013, at 11:14 AM, William wrote: I just noticed that both BOMs (BsOM?) are marked SOLD. I'm happy to see that. On one hand it removes the temptation for me to buy that 54cm Hunqa, but on the other hand it's cool to see that generating a little cash flow for Riv. Congrats to the new owners of those two great looking bikes! -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: FS 68cm Quickbeam
Jim, I like them and wouldn't / won't (since it doesn't appear it's going to sell) change them out.I like them a bit higher than other bars I have. I am looking for a Mustache bar like these that come back farther for a more upright position as well then I could lower them back down again. Ut OH I'm attempting thought and it's failing me... with the bars up they are comfortable and handle all riding positions.. I just don't like seeing that much stem. :) So I'll take a bit of discomfort rather than put them up that far? Up in the hooks they are perfect. :) Kelly On Wednesday, March 20, 2013 3:07:38 PM UTC-5, Jim wrote: Nice bike, shows a lot of thought. What did you think of the mustache bars? Jim D Massachusetts On Tuesday, March 19, 2013 3:00:58 PM UTC-4, Kelly wrote: S... if no one bites I get to keep it :) On Tuesday, March 19, 2013 10:16:42 AM UTC-5, BSWP wrote: Wow, what a great deal for such a rare TALL frame. - Andrew, Berkeley -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Bikes of the Month (Bike of the Months?)
*Bike Of the Month - Well that's the idea at least. Monthly or so one employee whips up a dreamy build with some less-than-usual stuff on it and it becomes a demonstrator bike in the showroom (unridden) and a web special. * I saw both these listings before they were sold. On Wednesday, March 20, 2013 3:34:14 PM UTC-7, Cyclofiend Jim wrote: If I understood the announcement, the Bike-O-The-Month is only for bikes which were sold. The folks at RBW who built them up suggest them for photos before they are boxed and/or delivered, and they then pick one each month as a unique or exemplary build. Since there's such a variance in the each bicycle is actually spec'd, I think one of the benefits is that it get people thinking about the variety of ways to rig theirs up. Yeah - I'm enjoying it! - J On Mar 20, 2013, at 11:14 AM, William wrote: I just noticed that both BOMs (BsOM?) are marked SOLD. I'm happy to see that. On one hand it removes the temptation for me to buy that 54cm Hunqa, but on the other hand it's cool to see that generating a little cash flow for Riv. Congrats to the new owners of those two great looking bikes! -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Bullmoose on a Homer Hilsen? Opinions please!
Curious about the bunch's opinion/recommendations about Bullmoose bars on a Homer Hilsen. I was thinking about some Albatross bars in an alternative to Noodle bars but Bullmoose look pretty cool. I'm just not sure about functionality, ect. I would definately throw Bullmoose bars on a Hunqapillar but I haven't had the opportunity to score one yet. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
Re: [RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
I also went to school for geology. I took mineral physics in grad school, which was basically stress/strain/fatigue on the molecular level. I've never used it in any professional capacity, but when it comes to discussing handlebar failures, I can sling BS with the best of them. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: Bombadil v. 2.0 and new Fatty Rumpkins
We assembled a Swiss army bike a few years ago. The owner got drunk and went on eBay. The result was that a rattling box of rusty lumps of metal arrived on his doorstep a week later. It was an interesting relic, and black, and 650B (though modern 650B tires didn't work). Otherwise it didn't have much in common with the fine specimen we're discussing here. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] FS: Berthoud gray banana saddlebag like new
I have a very lightly (less than a week while I was on a trip) used gray Berthoud banana saddlebag with tan leather trim. It's the conventional attaching one (not Klick Fix) with an elastic cord to close the flap instead of a buckle. It's this one: http://www.peterwhitecycles.com/images/products/Packs/bertsaddleelgr.jpg (light not included) These sell for $115 new, asking *$85 shipped, obo.* ** Thanks, Michael Scholten Grand Rapids, MI -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: Bullmoose on a Homer Hilsen? Opinions please!
I have one, and have used it on a Bstone mtb and Bstone road bike. I can't see any reason why you would use them on a Hunqapillar, but not a Hilsen. If you like sweptback-type bars, and dig the look (I do), I say go for it. Joe Is that a mountain or road bike? Yes. Bernard Vallejo, CA. On Wednesday, March 20, 2013 6:42:36 PM UTC-7, Eric wrote: Curious about the bunch's opinion/recommendations about Bullmoose bars on a Homer Hilsen. I was thinking about some Albatross bars in an alternative to Noodle bars but Bullmoose look pretty cool. I'm just not sure about functionality, ect. I would definately throw Bullmoose bars on a Hunqapillar but I haven't had the opportunity to score one yet. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Looking for 650b wheelset and tires?
Before I purchase a new set, anyone have something for sale? My wife rides her RB-1 every day and I'd like to step up to a 650b dynamo front and 130 spaced rear. I'm open to a straight trade for a 700c wheelset as well. I'll put a post on the 650b site as well for good luck. Thanks! -Ely -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: Bombadil v. 2.0 and new Fatty Rumpkins
Dig the frame bag... NICE!!! On Wednesday, March 20, 2013 12:38:52 PM UTC-4, Liesl wrote: On Monday, March 18, 2013 8:10:01 PM UTC-5, Ryan wrote: Sorry...speechless. That looks like a Swiss Army bike for sure. I like the black. You could travel the world on thatneat components Here's a Swiss Army bike for sure... https://lh6.googleusercontent.com/-_DHDYhgscOc/UUnl7FcoD4I/ABU/hSRzuBpwxOA/s1600/PC260173.JPG -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
... trouble, with a capital T and that rhymes with P and that ... As is frequently the case in the physical sciences, if you measure accurately enough commonly stated generalities turn out not to be exactly correct. Published values for the stiffness of different types of steel are different. Same thing for aluminum. But those differences are not that big, and the people developing the materials are usually focused on other properties that vary more dramatically. Apply something like the logic Grant uses to argue a few ounces of frame weight are meaningless, and you are likely to conclude that the differences in the stiffness of various steels used to make bikes (or aluminums used to make components) is insignificant. Now fatigue life of components, that makes bulk modulus and yield strength of a material seem trivially simple by comparison. On Wednesday, March 20, 2013 8:39:45 AM UTC-7, grant wrote: I thought-think-was taught that steel has a load limit below which it can withstand a theoretically infinite number of cycles (flexes), but that aluminum has no such thing. Permanent bending load limit is the Yield strength. Yield strength is the force required to bend a material to the point where it doesn't snap back all straight again. Spring steel (used in springs) has a high yield strength; paperclip steel (used in ) is the opposite. On this topic, vaguely: I was at a materials testing facility two days ago, and remember the hooplah I set off when I suggested that maybe modulus varies with UTS (sorry for the jargon, but I'm too tired to explain). I got so much correction mail that I was forced into a slightly insincere recantation. Well...the head guy at this place was saying that a crank arm made of X would be stiffer than one of idental design made of Y, and so I said politely, Oh really? and he said of course, and I said what about modulus's independence of UTS? and he said no way, we've done this test a zillion times, and then showed me a tech insider's website that listed diff moduli for two alum alloys of diff strengths. I'm just here to cause trouble. I won't respond to an discussions on this, on account of I've beenthere done that...and I will always play my two year diploma, what kind of fool listens to me? card, if pressed. On Wednesday, March 20, 2013 8:08:03 PM UTC+8, Ron Mc wrote: great photo Philip. I put 30 years on a GB Maes bend. Jim, as far as the cycle and S-N curve goes, only cycles that are 70% or greater of the permanent bending load count. Everything below that is within the endurance limit. On Monday, March 18, 2013 6:15:07 PM UTC-5, Philip Williamson wrote: So aluminum bars sag before breaking? I only ask, because I'm a 250 lb guy using 25 year old WTB offroad drops on a fixed gear bike... offroad sometimes. http://www.flickr.com/photos/philipwilliamson/8547042814/ Philip www.biketinker.com On Monday, March 18, 2013 2:49:21 PM UTC-7, William wrote: Jim I think that's what I said. The cycle life is determined by how it's loaded, and is captured on an S-N curve. You are correct that a tiny load is at the ultra-long life end of the S-N curve. If the S-N curve tells us that the cycle life is 50million cycles, and if you do 100,000 cycles per year, then Bob's your uncle, it's 500 years of life. For all us (relatively) normal people, we have no clue what cycle we are on. So we are left with judgement. Like I weigh 170, and I don't reef on my bars too hard, so I think I'll worry after 20 years or when I notice my bars sagging, whichever comes first. Someone else may decide I weigh 110, and it's a path bike. I'll never replace bars out of fear. Finally, another person might say I weigh 240 and sprint to every single city limit sign, and climb out of the saddle on my fixie on every hill. 5 years sounds like a good plan The thing that shocks me is how often I see people using bars that are visibly sagging. The tops of the handlebars drooping downward, and the hooks no longer parallel. That's scary. On Monday, March 18, 2013 2:21:42 PM UTC-7, Jim Thill - Hiawatha Cyclery wrote: The number of years is irrelevant. Some skinny person who rides upright and gingerly on smooth roads 5 miles per week is going to get 500 years out of the bar. On Monday, March 18, 2013 4:10:09 PM UTC-5, William wrote: You pose two questions: 1. Anyone know anything about aluminum bar life? I know a little bit about fatigue life of materials. Any metal that is cyclicly loaded will fatigue and fail eventually. Just about every metal has a similar look to it on an S-N curve (Wikipedia that for an explanation). The take home is that almost everything eventually wears out and fails. It's just a matter of when. Steel is a notable exception. If steel is cyclicly loaded at a low enough Stress, then it essentially never fatigues. Incredible
[RBW] are there any true 700x40 plush, high tpi tires?
Just wondering if anyone has come across any 700x40 tires that are higher tpi( 120). Im kind of imagining a Jack Brown Green but in 40mm size. But Im prolly just be dreaming. I know that Schwalbe makes a bunch of tires in that size range, and I like those tires, but they've always felt a bit sluggish to me. thanks in advance. -Mike -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: are there any true 700x40 plush, high tpi tires?
Mike: I've used Schwalbe Marathon Supremes (foldable) on my Atlantis for several years, first in 35 and lately in 40 mm. At 50-60 psi, the ride is quite nice. Plush is tough to define, and I've never ridden the Jack Browns, so can't offer a comparison. I rarely get flats. In 40 mm, rears last over 7,000 miles and the one currently on the front just ticked over 11,000 miles. While it has some life left, it will be replaced before the next big tour. While they are a bit spendy, I think the cost per mile and lack of flats make them worthwhile. dougP On Wednesday, March 20, 2013 9:32:52 PM UTC-7, Michael Williams wrote: Just wondering if anyone has come across any 700x40 tires that are higher tpi( 120). Im kind of imagining a Jack Brown Green but in 40mm size. But Im prolly just be dreaming. I know that Schwalbe makes a bunch of tires in that size range, and I like those tires, but they've always felt a bit sluggish to me. thanks in advance. -Mike -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
[RBW] Re: RivReader asks if aluminum bars should be replaced after 5 years?
Guy goes into a bar: Maybe modulus varies with UTS, amirite, people!? On Wednesday, March 20, 2013 8:39:45 AM UTC-7, grant wrote: I thought-think-was taught that steel has a load limit below which it can withstand a theoretically infinite number of cycles (flexes), but that aluminum has no such thing. Permanent bending load limit is the Yield strength. Yield strength is the force required to bend a material to the point where it doesn't snap back all straight again. Spring steel (used in springs) has a high yield strength; paperclip steel (used in ) is the opposite. On this topic, vaguely: I was at a materials testing facility two days ago, and remember the hooplah I set off when I suggested that maybe modulus varies with UTS (sorry for the jargon, but I'm too tired to explain). I got so much correction mail that I was forced into a slightly insincere recantation. Well...the head guy at this place was saying that a crank arm made of X would be stiffer than one of idental design made of Y, and so I said politely, Oh really? and he said of course, and I said what about modulus's independence of UTS? and he said no way, we've done this test a zillion times, and then showed me a tech insider's website that listed diff moduli for two alum alloys of diff strengths. I'm just here to cause trouble. I won't respond to an discussions on this, on account of I've beenthere done that...and I will always play my two year diploma, what kind of fool listens to me? card, if pressed. On Wednesday, March 20, 2013 8:08:03 PM UTC+8, Ron Mc wrote: great photo Philip. I put 30 years on a GB Maes bend. Jim, as far as the cycle and S-N curve goes, only cycles that are 70% or greater of the permanent bending load count. Everything below that is within the endurance limit. On Monday, March 18, 2013 6:15:07 PM UTC-5, Philip Williamson wrote: So aluminum bars sag before breaking? I only ask, because I'm a 250 lb guy using 25 year old WTB offroad drops on a fixed gear bike... offroad sometimes. http://www.flickr.com/photos/philipwilliamson/8547042814/ Philip www.biketinker.com On Monday, March 18, 2013 2:49:21 PM UTC-7, William wrote: Jim I think that's what I said. The cycle life is determined by how it's loaded, and is captured on an S-N curve. You are correct that a tiny load is at the ultra-long life end of the S-N curve. If the S-N curve tells us that the cycle life is 50million cycles, and if you do 100,000 cycles per year, then Bob's your uncle, it's 500 years of life. For all us (relatively) normal people, we have no clue what cycle we are on. So we are left with judgement. Like I weigh 170, and I don't reef on my bars too hard, so I think I'll worry after 20 years or when I notice my bars sagging, whichever comes first. Someone else may decide I weigh 110, and it's a path bike. I'll never replace bars out of fear. Finally, another person might say I weigh 240 and sprint to every single city limit sign, and climb out of the saddle on my fixie on every hill. 5 years sounds like a good plan The thing that shocks me is how often I see people using bars that are visibly sagging. The tops of the handlebars drooping downward, and the hooks no longer parallel. That's scary. On Monday, March 18, 2013 2:21:42 PM UTC-7, Jim Thill - Hiawatha Cyclery wrote: The number of years is irrelevant. Some skinny person who rides upright and gingerly on smooth roads 5 miles per week is going to get 500 years out of the bar. On Monday, March 18, 2013 4:10:09 PM UTC-5, William wrote: You pose two questions: 1. Anyone know anything about aluminum bar life? I know a little bit about fatigue life of materials. Any metal that is cyclicly loaded will fatigue and fail eventually. Just about every metal has a similar look to it on an S-N curve (Wikipedia that for an explanation). The take home is that almost everything eventually wears out and fails. It's just a matter of when. Steel is a notable exception. If steel is cyclicly loaded at a low enough Stress, then it essentially never fatigues. Incredible stuff. Anyway, Aluminum does fatigue and fail...eventually. When? It depends on how much you are stressing it and how many cycles you put on it daily. 2. Do I need to throw away the old used set of bars I have? Nitto is going to say what they say because they generate these S-N curves and test the heck out of their products. They do see parts fail after lots of cycles, and what they recommend is going to be conservative. When Nitto says 5 years, I think 20. I do not think 50 years. You don't know when your bars are going to fail unless you know REALLY accurately what the loading history of your bars is. In other words, you have no idea. Anybody who decides to buy and ride used equipment assumes some additional risk because you just don't know
